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Pololu Universal Aluminum Mounting Hub for 3mm Shaft, #4-40 Holes (2-Pack)
These universal aluminum mounting hubs allow you to mount custom wheels and mechanisms to 3 mm diameter motor shafts. The set includes two hubs, two #4-40 set screws for securing the hubs to motor shafts, and one 0.05″ Allen wrench for use with the set screws. Each hub has four threaded mounting holes for #4-40 screws (not included).
We have an assortment of universal mounting hubs available, spanning several shaft sizes and featuring mounting holes threaded for metric or imperial screws:
Alternatives available with variations in these parameter(s): shaft diameter mounting hole size Select variant…
Compare all products in Pololu Universal Mounting Hubs or
Adapters for 3mm Shafts.
| Description | Specs (4) | Pictures (2) | Resources (2) | FAQs (0) | On the blog (0) | Distributors (36) |
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Dimensions
| Size: | 17.5 mm diameter × 5 mm thick |
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| Weight: | 2.8 g1 |
| Shaft diameter: | 3 mm |
| Mounting hole size: | #4-402 |
Notes:
Coupon Discount
BF25C137: Get 32% off one or more items from category Pololu Universal Mounting Hubs (limit 5 per item). This offer is valid through 01 Dec 2025.












